From time to time I need to check my systems memory usage and what processes is consuming the most of it. Sure, there is a ps command or a top command which can handle well this kind of job, but what a heck, we want to practice little bit bash commands, right?
#!/bin/bash
#!/bin/bash
###################################################################################################
#
# Simple script for getting TOP n memory-consumming processes
#
# NOTE: The information shown on output comes from ps-command so is somehow kernel-dependent.
#
# Options:
# -u <list> : a comma-delimited list of users for which we query the memory usage
# -c : clear the cache(garbage) memory before querying memory usage
# -t <n> : specify how to trim the output; when n=0 or not specified then the script will attempt to
# determine the terminal's visible lines and to adapt n to that
# -p <pid> : filter output to specific pid; when pid not specified then will filter the output by current process pid
# -f : display command parameter list, otherwise display just the command full path
# -h : display help ussage
#
# Comment : This code is far from beeing elegant/bullet-proof but it's doing its job reasonably ;o)
#
# Usage example: topfree -u root,myusername -t 30 -c
#
# The above command will: (1) drop the cache memory and (2) output the most 30
# memory-consuming processes for user "root" and "myusername"
#
# topfree -u "" -t 0 (or just run ./free.sh without parameters)
#
# The above command will (1) determine the number "n" of visible lines of your
# terminal and (2) will output the most "n" memory-consuming processes for
# any user (see the empty user list "")
#
# Author : eugenmihailescux at gmail dot com
# Last update : 02.Oct.2011
#
##################################################################################################
# variable initialization
MB=1024 # memory information will be expresed in MB insted of mb
# read the command-line parameter
while getopts ":cfhp:t:u:" optname
do
case "$optname" in
"c")
cc="1"
;;
"t")
top=$OPTARG
;;
"u")
p_user=$OPTARG
;;
"f")
f_list="1"
;;
"p")
ppid="1"
pid=$OPTARG
if [ -n "$pid" ];then
pid="-p $pid"
fi
;;
":")
if [ $OPTARG="p" ];then
ppid="1"
fi
;;
"h")
echo
echo "Simple script for getting TOP n memory-consumming processes (v0.1)"
echo " usage : $0 [options]"
echo " options :"
echo -e "\t-u <list> : a comma-delimited list of users for which we query the memory usage"
echo -e "\t-c : clear the cache(garbage) memory before querying memory usage"
echo -e "\t-t <n> : specify how to trim the output; when n=0 or not specified then the script will attempt to determine the terminal's visible lines and to adapt n to that"
echo -e "\t-p <pid> : filter output to specific pid; when pid not specified then will filter the output by current process pid"
echo -e "\t-f : display command parameter list, otherwise display just the command full path"
echo -e "\t-h : display help ussage"
exit 0
;;
esac
done
let "mem=`cat /proc/meminfo |head -1|awk '{print $2}'`/1000" # meminfo is shown in kB not KB
if [ -n "$ppid" ]; then
user=$pid
user_str="current command"
else
if [ -z "$p_user" ];then
user="ax"
user_str="any user"
else
user="aU "$p_user
user_str="user [$p_user]"
fi
fi
if [ -z "$top" ];then
let "top=$(tput lines)-9" # adjust terminal rows number
else
if [ "$top" == 0 ];then
let "top=$(tput lines)-9" # adjust terminal rows number
fi
fi
if [ -n "$cc" ]; then
if [ "$(whoami)" != "root" ]; then
echo "[!] : Cache dropping require 'su' password"
su -c "sync && echo 3 > /proc/sys/vm/drop_caches"
err=$?
ccdone=0
else
ccdone=-1
fi
if [ $ccdone -lt 0 ]; then
su -c "sync && echo 3 > /proc/sys/vm/drop_caches"
err=$?
fi
if [ $err -eq 0 ]; then
echo " INFO : Cache dropped successfuly!"
let "top=$top-5" # adjust terminal rows number
else
echo " WARNING : Cache not dropped due to an unexpected error"
fi
fi
echo ""
echo -e " \033[1;33mThe TOP $top memory-consuming processes of $user_str are:\033[0m"
echo "================================================================"
echo -e "\033[7m PID User (%) Size(MB) Process name \033[0m"
echo "================================================================"
sep="@!@"
ps hu $user| awk '{cmd_param=""; for (i=12;i<=NF && f_list=="1";i++){cmd_param=sprintf("%s%s%s",cmd_param,sep,$i);}; printf("%s %s %f %f %s %s\n", $2, $1, 100*($6/MB)/mem, $6/MB, $11, cmd_param);}' f_list=$f_list sep=$sep pid="$pid" mem=$mem MB=$MB |sort|uniq|awk '{gsub(sep," ",$6); printf("%d\t%s\t%5.2f\t%5.2f\t\033[2m%s %s\033[0m\n", $1, $2, $3, $4, $5, $6)}' sep=$sep| sort -b -k3rn,3 | head "-$top"
echo "================================================================"
if [ $mem -ge $MB ];then
p_mem=$(awk -v mem="$mem" -v MB="$MB" 'BEGIN { print mem/MB }')
unit="GB"
else
let "p_mem=$mem"
unit="MB"
fi
echo $p_mem $unit| awk '{printf("\033[1;34m Total memory :\t%.2f %s\n", $1, $2)}'
ps u $user | awk '{ memory = memory + $6/MB }; END { printf(" Total usage :\t%5.2f MB (~ %5.2f %% of physical memory)\033[0m\n", memory, 100*memory/mem) }' mem=$mem MB=$MB
echo "================================================================"
List top n memory consuming processes Linux
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Eugen Mihailescu
Founder/programmer/one-man-show at Cubique Software
Always looking to learn more about *nix world, about the fundamental concepts of math, physics, electronics. I am also passionate about programming, database and systems administration. 16+ yrs experience in software development, designing enterprise systems, IT support and troubleshooting.
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